This is a Fire King Jade-ite Extra Heavy Mug from my home collection. I purchased it at an antique shop in the United States. Jade-ite Extra Heavy Mug ■Size: W11 x H8.7 x φ8.5 cm ■Markings: OVEN Fire King WARE ■Condition: Excellent to Near Mint No chips or cracks. It shows no signs of use and has no noticeable damage. Overall, it's a beautiful item with a good shine. There is a slight manufacturing flaw (flea bite) on the rim. There are manufacturing-related imperfections such as air bubbles, metal marks, glass striations, white spots, and hairline (indentation lines). Both the inside and outside are smooth and have a very good shine! Fire King is a tableware brand manufactured by the Anchor Hocking company in the United States from the 1940s to the 1970s. Please understand that this is a vintage item before purchasing. [Notes] Due to the nature of vintage items, there are generally scratches and stains. Manufacturing variations such as unevenness, glass striations, hairlines, air bubbles, black spots, white spots, distortions, and color unevenness are not explicitly stated. Please understand these as characteristics of the product before purchasing. Please ask if you have any questions. Antique